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61.
In this paper the duskward extension of the westward auroral electrojet is investigated for substorm intervals on the basis
of magnetograms recorded at the Indian Antarctic station, Maitri. The database comprises three years from 1998–2000. Based
on an initial study of the magnetograms, an arbitrary local time of 2030 MLT is fixed to define the early manifestation of
the substorm westward electrojet. Using this criterion 12 substorms are identified and the possible causes examined. Many
of these events are observed to be associated with a moderate to intense ring current. The hourly average of the GSM BY-component of the interplanetary magnetic field (IMF) for the hour preceding the substorm onset at Maitri is negative for
most of the events. It is suggested that the azimuthal shift of the auroral electrojets in the southern hemisphere resulting
from a negative BY-component of the IMF influences the extent of the substorm westward electrojet. This finding implies that the IMF may have
a role in controlling the longitudinal extent of substorm occurrence. 相似文献
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C. M. Tiwari D. P. Tiwari Ajay K. Pandey Pankaj K. Shrivastava 《Journal of Astrophysics and Astronomy》2005,26(4):429-434
The average characteristics of the diurnal and semi-diurnal anisotropy of cosmic ray intensity at relativistic energies have
been obtained by using data from the worldwide grid of neutron monitor for the period 1989 to 1996. The complex behaviour
of the diurnal amplitudes and time of maxima (phase) and its association with the Ap index on a long-term and day-to-day basis
have been studied. Even though the general characteristics, on a yearly average basis, have not changed significantly during
this period, both the diurnal and semi-diurnal amplitudes and phases vary significantly, besides significant changes being
observed for different interplanetary conditions on a short-term basis. It is found that the relationship between the Ap index
and the diurnal vector is out of phase during the period 1991 to 1995. On a long-term basis, the correlation of diurnal variation
with Ap index has been found to vary during the solar cycle. On a short-term basis, it has been observed that the high Ap
days are usually associated with higher amplitudes with phase shifted to earlier hours. 相似文献
65.
Optimal allocation of water and land resources for maximizing the farm income and minimizing the irrigation-induced environmental problems 总被引:1,自引:1,他引:0
Ajay?SinghEmail authorView authors OrcID profile 《Stochastic Environmental Research and Risk Assessment (SERRA)》2017,31(5):1147-1154
The continuous decrease in good quality water and land resources and concurrent increase in global population accentuates the need of optimal allocation of these resources to fulfilling the rising food requirements. This study presents the formulation and application a management model for the optimal allocation of available good quality water and land resources to maximize the farm revenue of a canal command area. A groundwater balance constraint was imposed on the model, which moderates the irrigation-induced environmental problems of waterlogging and salinization, while making the optimal allocation of resources. The model results show a reduction in mustard, rice, and gram crop areas against an increase in sorghum, millets, and wheat areas. The net annual revenue from the command area increased by about 18 % under the optimal allocation plans. The farmers and stakeholders concerned in the actual agricultural production process are suggested to use groundwater and canal water conjunctively to maximizing the farm income. This strategy would also mitigate the hydrological imbalances to the groundwater system without installing costly drainage systems which is not viable as the quality of groundwater is poor and drainage water may cause a serious disposal problem. The developed model can be used as a reliable decision tool for taking the farm and regional level decisions of optimal land and water resources allocation and is able to solve the irrigation-induced environmental problems of agricultural systems. 相似文献
66.
Verma Sunita Sharma Ajay Yadava Pramod Kumar Gupta Priyanshu Singh Janhavi Payra Swagata 《Natural Hazards》2022,112(2):1379-1393
Natural Hazards - The present study investigates the accelerating factors for extreme flash flood at Chamoli district of Uttarakhand on 7 February 2021. The Sentinel-2A and 2B satellite data have... 相似文献
67.
Review: Computer-based models for managing the water-resource problems of irrigated agriculture 总被引:1,自引:0,他引:1
Ajay Singh 《Hydrogeology Journal》2015,23(6):1217-1227
68.
The present study assesses anthropogenic disturbances and their impacts on the vegetation in Western Himalaya, India on the basis of various disturbance parameters such as density, Total Basal Cover (TBC) of cut stumps, lopping percentage and grazing intensities. On the basis of canopy cover and frequency of disturbances (%), the studied forests were divided into highly disturbed (HD), moderately disturbed (MD) and least disturbed (LD) categories. The HD forests had the lowest canopy cover, lowest density and lowest TBC and the LD had the highest canopy cover, highest density and highest TBC. The MD forests occupied the intermediate position with respect to these parameters. Species richness was least in HD forests, highest in one of the MD forests while LD forest occupied an intermediate position. The percentage of regenerating species was lowest (54%) in HD and highest (72%) in MD. The density of seedlings and saplings was higher in one of the MD forests as compared to HD and LD. We concluded that the moderate disturbances do not affect the vegetation adversely; however the increased degree of disturbance causes loss in plant diversity; affects regeneration and changes community characteristics. Construction of hydroelectric projects at various places in the study area was found to be one of the most important sources of anthropogenic disturbances in addition to the routine anthropogenic disturbances like grazing, fuelwood collection and fodder extraction. If all proposed dams in the Indian Himalaya are constructed combined with weak national environmental impact assessment and implementation, it will result in a significant loss of species. Therefore, various agents of disturbances should be evaluated in cumulative manner and any developmental activities such as hydropower projects, which trigger various natural and anthropogenic disturbances, should be combined with proper cumulative environmental impact assessment and effective implementation to minimise the anticipated loss of vegetation. 相似文献
69.
P. K. Misra A. K. Jauhri R. P. Tiwari S. Kishore Ajay Pratap Singh S. K. Singh 《Journal of the Geological Society of India》2011,78(4):355-364
The present paper records nine species of coralline algae from the Prang Formation of middle-late Eocene age from the Jaintia
Hills, Meghalaya. The algae are associated with the larger foraminifera including Nummulites, Alveolina and Discocyclina throughout the succession. The temporal distribution of algal species indicates that seven species are known from the Eocene.
Of the remaining two, one ranges from the Palaeocene to Eocene and the other is Palaeocene in age. The coralline algae and
larger foraminifers are differentiated into two associations, the lower one indicating inner-ramp environment of high energy
and the upper one showing deposition in relatively calm waters of deeper ramp environment. 相似文献
70.
Zoë E. Glas Jackie M. Getson Yuling Gao Ajay S. Singh Francis R. Eanes Laura A. Esman 《社会与自然资源》2019,32(2):229-237
Response rates to mail-based surveys have declined in recent decades, and survey response rates for farmers tend to be low overall. Maintaining high response rates is necessary to prevent non-response bias. Historically, incentives have been an effective tool to increase response rates with general populations. However, the effect of incentives on farmers has not been well tested. In this study, we experimentally manipulated the use of a $2 incentive in two surveys targeted at farmers. We tested both the use of the incentive and the timing of incentive distribution in the survey process. We found the incentive significantly increased response rates with farmers but there was no significant effect of when the incentive was distributed. Additionally, we evaluated the cost-effectiveness of using the incentive. While the incentive increased response rate, the cost per survey response also increased and the cost of the incentive was not offset by the increased response rate. 相似文献